/**
 * #      面试题 04.05
 * 名称   合法二叉搜索树
 * 链接   https://leetcode-cn.com/problems/legal-binary-search-tree-lcci
 * 题解   [243](https://leetcode-cn.com/problems/legal-binary-search-tree-lcci/solution)
 * 通过率 34.4%
 * 难道   中等
 */

